> >You can reduce CO2 from vehicles by fueling them with electricity, hydrogen, or > >natural gas. In fact, any hydrocarbon fuel with a lower carbon content will > >reduce CO2. > > To be as accurate about this as possible: CO2 reduction would factor > in both the Carbon ratio in the fuel and the mpg. A fuel with a lower > Carbon ratio, like Methane (CH4), would result in lower CO2 emissions > only if its mileage was sufficient. If it got terrible mileage, then > its CO2 emissions might even be higher than petrol emissions. On > balance, I think the for NG vehicles, the CO2 emissions picture is > excellent. > > A fuel like Ethanol, (C2H3OH) I don't know. I don't think the mileage > per BTU is particularly bad, but I don't know how the CO2 calculations > would go. I'm sure the opponents who assume the worst about biofuel > derivations would assume a very poor net-energy for ethanol, after > energy has been invested in creating it, so they might say the CO2 > emissions are enormous, over the whole process. >
Bio-fuels don't contribute ANY net gain CO2. The CO2 they produce is absorbed by growing the plants to produce the bio-fuel. Personally I'm now leaning towards 100% bio-diesel or straight vegetable oil. Almost exactly the same emissions as CNG, and it's renewable. Also these are viable options for amateurs to use to extend the range on their EVs. Amateur vehicle conversions to propane or CNG are no longer legal because they usually end up causing MORE pollution than normal vehicles.
